Hi! Thanks for the video! There is one small detail I noticed. Seems like you proved that D lies in , and there should be a prove that lies in D as well. UPD: oh but... if r and s belong to D, this is obvious)))
I'm surprised you didn't just use the general result that any subgroup of index 2 is automatically a normal subgroup. (Sketch of proof: if [G:H] = 2, then the only possible cosets of H are H and G - H, thus every left coset is a right coset, and so H is normal in G.) Of course, you know your audience better than I. Are you in Ma5, or were you able to skip even further to Ma120? (A.k.a Ma5!)
Mu prime!!!!
This videos helps me understand my algebra class! Thank you!
Thanks man for doing algebra
Hi! Thanks for the video! There is one small detail I noticed. Seems like you proved that D lies in , and there should be a prove that lies in D as well.
UPD: oh but... if r and s belong to D, this is obvious)))
He’s back !
Very nice explanation... Looking forward more videos from you...
Super cool 😎
wonderful!
I'm surprised you didn't just use the general result that any subgroup of index 2 is automatically a normal subgroup. (Sketch of proof: if [G:H] = 2, then the only possible cosets of H are H and G - H, thus every left coset is a right coset, and so H is normal in G.) Of course, you know your audience better than I.
Are you in Ma5, or were you able to skip even further to Ma120? (A.k.a Ma5!)